package com.yun.filter;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

@WebFilter("/home")
public class homeFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        HttpSession session = request.getSession();
        Object user = session.getAttribute("uname");
        if(user != null){
            //放行
            filterChain.doFilter(request,response);
        }else {
            //未登录不允许访问首页，跳转登录页
            request.getRequestDispatcher("/jsp/login.jsp").forward(request,response);
        }

    }

    @Override
    public void destroy() {

    }
}
